Abstract
In order to investigate the condition of the threshold of micro fatigue crack propagation under mixed mode, plane bending and cyclic torsion tests, and the various combinations of them are carried out under the condition of the stress ratio R=-1 by using the annealed cracked specimens made of carbon steel. Based on the assumption that a crack begins to propagate when the circumferential principal stress reaches a critical value peculiar value peculiar to the material, the stress condition at the threshold of crack propagation under mixed mode can be explained by applying the test results of plane bending and cyclic torsion.
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